Display screen or portion thereof with transitional graphical user interface



FIG. 1 is a front view of a first image of a display screen or portion thereof with transitional graphical user interface;

FIG. 2 is a front view of a second image thereof; and,

FIG. 3 is a front view of a third image thereof.

The graphical user interface of FIGS. 1-3 sequentially transitions among FIGS. 1-3. The process or period in which the transition occurs forms no part of the claimed design.

The outer broken lines indicate a display screen or portion thereof and form no part of the claimed design. The features shown in the inner broken lines and lighter text illustrate portions of the graphical user interface that form no part of the claimed design. 

CLAIM The ornamental design for “display screen or portion thereof with transitional graphical user interface,” as shown and described. 